I think it’s accurate as a snapshot of right now.
But I’d expect band usage among the networks to change over coming months as they repurpose the frequencies that are freed up by the 3G shutdown.
But none of that tells you about the coverage of each network. Coverage is mostly about how many towers they have and where. Bands come into only insofar as lower frequencies carry less data but go further, and high frequencies carry more data but get blocked easily.
I can’t vouch for it specifically, but this tool seems to let you compare different network coverage maps fairly easily.
EDIT: In aggregate it’s a simple fact that Optus coverage is much better than Vodafone. All the 4G bands of both carriers are supported by FP5, so that will remain true for us. The map might be useful for checking localised coverage in places important to you.